The Duke and Duchess of York's marriage didn't work out. However, the pair remains close today. In fact, some royal fans want Prince Andrew and Ferguson to rekindle their romance. But this may not sit well with Prince Charles, who reportedly doesn't approve of their relationship in the first place.

"[Andrew] has been a liability to the Royal Family," Katie Nicholl said on Netflix's documentary "The Royal House of Windsor" (via Express). "His relationship with [Sarah Ferguson] is one of the things, I’m told, that really riles Charles. It all contributes together into something that is just not very palatable."

Prince Charles is not the only royal who reportedly disapproves of Ferguson for Prince Andrew. Princess Anne and Prince Philip reportedly share the same sentiment. According to Allan Starkie, Ferguson was most afraid of the Duke of Edinburgh even before her divorce from the Duke of York.

"Earlier on in the marriage, [Prince Philip] had told her 'now you're a member of the firm you can do anything you want, but you'll always be found out," Starkie said.

One time Ferguson reportedly walked into a room to have dinner with the Queen and Prince Philip and she greeted each servant with their names, but the 97-year-old senior royal wasn't impressed. "I thought you give up flirting with the servants ago?" Prince Philip told Ferguson.

Princess Anne also made Ferguson felt that she's not part of the Firm. The Royal Princess reportedly called her "outsider" during a family lunch which infuriated Prince Andrew who demanded that his royal sister apologized to his wife. Since then, there was a "very, very frosty relationship between Fergie and Anne."

Although a number of royals didn't approve Ferguson for Prince Andrew, the Duchess of York found a friend in the person of Princess Diana. In fact, it was the late Princess of Wales who introduced the two to each other. However, their friendship didn't end well. In fact, they stopped talking to each other prior to the People's Princess' tragic accident.

"Diana was one of the quickest wits I knew; nobody made me laugh like she did," Ferguson wrote in her 2011 book "Finding Sarah." "We took vacations together with our children. Sadly, at the end [of the Princess's life] we hadn't spoken for a year, although I never knew the reason, except that once Diana got something in her head it stuck there for a while."